I've been working very hard to save up for a basketball that costs $40. I started with $19 and earned another $20 in the last month. How much money do I have now?

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?